Leaderboard

As much as I love making electrostatic headphones, I don't think that I will ever make them for money. I'm just too busy with my work, and I really prefer sharing my knowledge and encouraging people to try to build them by themselves. I am willing to share everything of my design with everyone. Just let me know if you're interested to build. By the way, making a pair of good sounding electrostatic headphones isn't that difficult, but to make them as efficient as Stax headphones is not so easy. Until MrSpeakers and Phenomenon can make their phones to sound as loud as Stax, I would say that they still have a lot to learn.

Reminds me that I took a pic but completely forgot to post it when I had dessert at the great cafe in the Neue Gallery the other day. Also pictured is the accompanying double espresso with whipped cream.

So, here's where a little math beforehand would have helped out. Now, the 10M90S is specified as having a thermal resistance of 80K/W junction to ambient (K = Kelvin, so 0 degrees Kelvin is absolute zero, each degree Kelvin = 1 degree centigrade), and the C2M10000170D is specified as having a thermal resistance of 40K/W junction to ambient. As these devices are rated to run below 150 degrees centigrade, what this means is that the 10M90S without heatsink is rated for less than 2 watts, and the C2M is rated for less than 4 watts. The 10M90S split the PS voltage between them (for as long as they were functioning), so 400 volts each at 20 mA = 8 watts. Running a transistor at 2 and 4 times their rated power dissipation will blow them in short order. If you've ever seen the actual size of the transistor inside its case you will understand why they can get fried quickly by being overstressed. Therefore, you need to replace ALL the C2Ms,all the constant current source 10M90S, and all the DN2540s as well, unless you're absolutely confident that the other devices protected them like a fuse. Which I doubt. Murphy's Law: a transistor protected by a fuse will blow first, protecting the fuse.

Tried my hand at soldering a pair of the regs on, using a Hakko 936 with a 3.2mm chisel tip. Had a hard time getting some of the pads to tin on the neg reg, used plenty of flux. Switched to my smallest point tip and ran around the outsides of the chip (from the YouTube video). My hot air station hasn't arrived yet, nor have the Meanwells. I'll put the associated components on tomorrow night and probably use my bench supply and see what happens. Sorry for the crappy photo, but let me know what you think.

Completely forgot to take a picture of the rainbow trout entree, but here's the S'mores tart dessert. It was crazy, crazy good.

He's just another Paul. Not THE Paul that OP is apauled about....or is that appaulled?

Looking at picking up my first guitar, thinking an electric acoustic. In un-Head-Case fashion I'm looking at spending $500 or less. Any suggestions on what to get or something someone wants to unload?

I used to buy new Brother laser printers for less than the toner cartridge. Same thing for a while with PTouch tapes. I was buying a new label maker for $10 with the tape. New tape was $20. They got smart and started sending them both out with "starter: toner or "starter" tapes. They also jacked up prices on the tapes and toner. I pretty much now hate everybody. Add Sony to the list I guess.

RIP Jo Jo! I haven't thought about that great Celtics team in a long time. I was a big fan back in the day and was among those that sat glued to the tv in that triple overtime game 5! When I saw Jo Jo sitting on the floor during some free throws, I learned what the meaning of 'heart" was!

RIP Jo Jo, a good memory of some of my early years.... Sent from my iPad using Tapatalk HD

The amp is a real glorious piece of shit. So of all the amps out there that they could "borrow" they picked... drumroll....the Koss E/90!!!

Jo Jo White, 71. RIP. He was an athlete who I admired and by all accounts a good man as well. Rock Chalk Jayhawks. https://www.nytimes.com/2018/01/16/obituaries/jo-jo-white-dead-boston-celtics.html

Stubbornly and bewilderingly low-fi production style but for some reason, it sounds wonderful on my poor little Stax rig. Colour me shocked. Shit be unfolding, yea verily.

Me: Roasted barramundi with risotto and roasted red pepper For Anne: Portobello gnocchi in Marsala sauce

Milled this today – negative regulator. Shot by USB camera approximately magnitude 20. Using a 15th end mill, minimum clearance between pads, traces etc. is 16th. There are 5 vias 12th and they actually hit the bottom pads quite accurate. CNC machine is a fantastic gadget